Draw a graph of $E$ versus $r$ for $r>>a$.

Important Questions on Electric Charges and Field

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 5

If this dipole were kept in a uniform external electric field $E_0$, diagrammatically represent the position of the dipole in stable and unstable equilibrium and write the expressions for the torque acting on the dipole in both the cases.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 6

Define electric flux. Write its SI unit.

MEDIUM

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 6

State and explain Gauss's law. Find out the outward flux due to a point charge $+q$ placed at the centre of a cube of side '$a$'. Why is it found to be independent of the size and shape of the surface enclosing it? Explain.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 7

Use Gauss's theorem to find the electric field due to a uniformly charged infinitely large plane thin sheet with surface charge density $\sigma$.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 7

An infinitely large thin plane sheet has a uniform surface charge density $+\sigma$ Obtain the expression for the amount of work done in bringing a point charge $q$ from infinity to a point, distant $r$, in front of the charged plane sheet.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 8

State Gauss's law. Using this law, obtain the expression for the electric field due to an infinitely long straight conductor of linear charge density $\lambda$.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 8

A wire $AB$ of length $L$ has linear charge density $\lambda =kx$, where $x$ is measured from the end $A$ of the wire. This wire is enclosed by a Gaussian hollow surface. Find the expression for the electric flux through this surface.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 9

"Gauss's law in electrostatics is true for any closed surface, no matter what its shape or size is". Justify this statement with the help of a suitable example.